APA (7th ed.) Citation

Chambers, R. W., & Wenzell, A. B. (2006). The Danger Mark. Project Gutenberg.

Chicago Style (17th ed.) Citation

Chambers, Robert W., and A. B. Wenzell. The Danger Mark. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Chambers, Robert W., and A. B. Wenzell. The Danger Mark. Project Gutenberg, 2006.

Warning: These citations may not always be 100% accurate.